Auxiliary brake cam rod latch adjuster



mud:

Jan. 5, 1954 B. A. DARR AUXILIARY BRAKE CAM ROD LATCH ADJUSTER Filed NOV. 8, 1949 ATTORNEYS Patented Jan. 5, 1954 AUXILIARY BRAKE CAM ROD LATCH ADJUSTER Barnett A. Darr, Quincy, Calif.

Application November 8, 1949, Serial No. 126,223

2 Claims.

This invention relates to auxiliary devices attached to or mounted on motor vehicles for taking up slack brake shoe actuating instrumentalities and in particular a slack adjuster mounted on the axle of a motor vehicle and connected to the brake cam rod whereby as the diaphram of the brake operating cylinder reaches the limit of movement further movement of the cam rod is provided by an auxiliary actuating cylinder and an auxiliary holding cylinder each of which actuates a pawl coacting with a ratchet wheel on the brake cam rod.

The purpose of this invention is to provide an auxiliary attachment for motor vehicles which extends the life of the brake actuated cylinder diaphragm by providing means for taking up slack in the connections between the cylinder and shoes of the brake drums.

In the usual brake actuating instrumentalities play develops in the wearing parts and the diaphragm of the brake actuating cylinder reaches the limit of its travel before the brakes are positively applied. With this thought, in mind this invention contemplates auxiliary means for picking up the operation of the brake operating parts after the diaphragm has reached its extreme movement whereby the brakes are positively applied.

The object of this invention is, therefore, to provide an vauxiliary attachment for motor vehicle brake systems whereby the movement of the brake cam rod may be continued to positively apply the brakes after the brake actuating cylinder has reached the end of its movement.

Another object of the invention is to provide an auxiliarybrake applying device for motor vehicles that may be attached to vehicles now in use.

A further object of the invention is to provide an auxiliary brake applying device for use after the brake actuating cylinder has reached the end of its travel which is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies a pawl carrying frame journaled on the brake cam rod with an auxiliary cylinder for continuing movement of the brake cam rod with the pawl engaging a ratchet on the rod and an additional pawl also actuated by a cylinder for coacting with a ratchet on the brake cam rod for holding the brake cam rod while the former pawl is advanced to take another grip on the ratchet coacting therewith.

Other features and advantages of the invention will appear from the following description taken in connection with the drawings wherein- Figure 1 is an elevational view with parts broken away and parts shown in section illustrating the brake cam rod of a motor Vehicle suspended from the axle by a hanger with the auxiliary cylinders, pawls and ratchet wheels mounted in combination with the rod and axle.

Figure 2 is an end elevational view with the axle shown in section illustrating the relative positions of the cylinder, coacting with pawls and ratchets.

Figure 3 is a detail illustrating the main actuating pawl in combination with the ratchet and the mounting elements thereof.

Figure 4 is a longitudinal section through the pawl and mounting elements shown in Figure 3 taken on line 4-4 of Figure 3 and with the ratchet wheel and outer part of the pawl shown in elevation.

Referring now to the drawings wherein like reference characters denote corresponding parts the auxiliary brake actuating device of this invention includes an actuating pawl I carried by floating arms II and I2 journaled on extended ends of a hub I3 of a ratchet I4, a diaphram cylinder I5 for actuating the pawl I0 through a connecting rod I6, and a holding pawl I'I actuated by a cylinder I8 and coacting with a ratchet Wheel I9 on the brake cam rod 20 on which the ratchet Wheel I 4 is also positioned.

As illustrated in Figures 1 and 2 the brake cam rod is suspended from an axle 2| by a hangerA 22 and the cylinder I5` is mounted on the axle bya bracket 23. With the parts arranged in this.- manner pressure on the connecting rod I6 Whichf is connected to the pawl I0 by a pin 24 forces the point 25 of the pawl into engagement with the teeth of the ratchet wheel I4 and with the pawl I0 journaled on a pin 26 in the outer ends of.'l the floating arms II and I2 the arms will draw the pawl I0 around the brake cam rod 20 in a.

rvcounterclockwise direction and with vthe bore of the hub I3 of the ratchet wheel I4 connected to the brake cam rod by splines 21 the brake cam od will be rotated in a counterclockwise direcion.

Should this movement not be suiiicient to fully apply the brakes pressure is applied to the cylinder I8 which, through the connecting rod 28 applies pressure to pawl I1 whereby the pawl I1 is forced into engagement with teeth of the ratchet Wheel I9 and With the ratchet wheel I9 also splined to the brake cam rod 20 by splines 29. this pawl and ratchet wheel will hold the brake cam rod in advanced position. The pressure may then be released in the cylinder l5 whereby the spring 30 will withdraw the pawl I so that the connecting rod I6 may be drawn 5 into the cylinder to rotate the iloating arms H and I2 in a clockwise direction whereby the pawl I0 takes another bite and is advanced several more teeth. Pressiga then be applied; selec; tively, with, the. use. ofa three-way valve the. l0 hose connections of the cylinders to the cylinder I5 and released in the cylinder I8 whereby the. spring 3| withdraws the pawl I1. t'he.,pawll j I0 again advances the movement of the brake earn rod in the counter-clockwise direction. This cycle of movements may be continued.` the. brake is positively applied.

Pawl I1 and the cylinder I8 are also mounted on the axle 2| by a bracket 32, the pawl lllbeing pivotally mounted in the; bracket by a pin 33 20 and the. ddunddtne ddd. 2,1, betes.- pirdtallr 02d: natedto-ddpdwlu.by'and.

Th riwl. 1211's pra-vided with?. an; tyd..v 3.5...

Whith. tief 'dddditiiia fdd. .6 isf C. ndedtdd by' the..y t and ad; dat. 36.1 td wkth the stirata 25 isconnefctedfas Yshown ink Eigurle. "lhefhub, 31'. if ttldjpdid '9.- tS dwindled ed the. pia 2.6- in.. a bidding. 38 the. dddsfdf which arepresided. with tended-33. and' 4.01- ddd. theidddtide, Il. and l2.' are dld. 'journal d In. the; Dini-J 2.6: by 30 ddgabushldg Ufdd'd di@ lzddpedtively Team@ 2`11rdvidddf Wthd. shduldei'.- i3 andathizeaded stud 44 with' a lock nut 45 thereon extendlsujrrn; theshoulder.. Thelook nut-4.5195. secured on, the

Std.. .r a. @.Qtts; die] fifths; @betete @dds of; '"f the `floating arms il and lll. allrefjournaled. on,

therSends of the hub |,3,.'by.bu,shing 4,1, and. 48, ris'peet'ivelY,A I y This... @einem brake apply ide devise, is.. mounted. td. dt. 'in Cedidddt'idrl! with, the usual t brake operating cylinder of the motor lehiczle,V and acpsupen the. brake @am fddwhed ,edt Wdar devenus this dpa'dtted.parqm`p1 demarage. o.: therrakeyimda ng..-

Stis.. Sdfdiedtly. tdjglipl the b.; ke! ddl steth.'dtttdiddt-fprddtdpdsi .lt/Selyldtf.. brakeandas#illustrated in thedvrawing', thac.

Patri. dlsdit.edtsbldt, tosti. ddtdeddrdddidef m vement of. thewbraxxe step by stcpby turning re.I Thus,

may; be dsedand only' 0de ddwlgwith.orientant 65..

Wheel operated thereby or as many cylinders and pawls may be used as may be desired.

It will also be understood that other modications may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

1. In an auxiliary brake cam rod ratchet adluster, tbe combination. which cdlztlprttddsv d m0- tor vehiclel axle, a brake Gam, md' suspended from the axle, a pair of spaced floating arms journaled on the brake cam rod and extended below` the axle, ratchet wheels splined on the said brale cam rod and positioned with one of the said ratchet wheels between the floating arms, apawl pivotally mounted in the outer end of the4 floating armsL and positioned to engage the ratchet wheel between the arms, a pressure cylinder.. carried by the axle and having a connecting rod pivotally connected to the said pawl, a, Serine dddeedtdd to the ddwl. at.. Ode. end. and t0 tledxle @ttm-.Otten dsetdndpdwl. pimtdlly m'ddted.- the. axle dddpdsition'ed t0. engage.

the.. rathetwheel on| the' brake earn rodv pvositidded. ddtidd. 0f. thdtdld floating. arms. we d- Odd 13185511.17@ Cyl, der Cdlrled. by the. axle. add

haring. a. cdndettidg rod pirdtally cdnrtedted: t9. the said secpddpawl) and. Spring connected@ the... Outer end. Ot the. Said @added dem. ddd. S99.- Orid presents. Cylinder f9.1?. urging. the. Said... seeded: paul away from the ratchet.. wheel.. eres: sure in thesecond cylinder is released 2,- In en auxildry brake dem liodratdhdtdd: lustery the @damnation whidh ddmprded. a. 1.1.19- tdrf rdhidld axle... a blade dem, 11nd.- Suspended." from the., axle, a pair.y 0f. Spdtdd. flldtillg dtmd.,

jourualed onl the. brake cam, rod: and. extended.

below the axle, ratchet.v wheels splined on the, Sai@ brak@ 051m. Od. and. 9051910.11@ W'QD 031.@ 0f' the. Said. ratchet Wh 81S. between. the., Heating.

alims dpdwlrivotallymounted in, the. Outer ddd; 0f, the fleeting attesi' dnd4v positioned to, engage. thdfatdhet. wheel. betweenI the arms. a. pressure. cylindercarried, by? theI axle andA having: a, oo nde'trtg. fdd pivdtallr cornectedtome said pawl.. d Serine. dddttddtdto the ndwl; at. one end and axle., attac. other, Second. pressure. cylinder.. carried by the axle and having a connecting rgd piydtdllrf. dddnectedto thdsaid. ,Second pawl'. .and a Spring cpndsdtedtd .the other. end.- Of. the. SaidL Seddd. awl. ddd. Seeded. pressure. Cylinder: i012 urging. the; Said. Seeded. Dawl awayY from the-.- rdtshdt, wheel. vided pressure.. in. thedecond. cyl-.- inddrislteleased- DARH.,

Refrencescitedfm the. die @.f das parent.

UNITED STATES PATENTS I.

Kuebler July,A 14; 1942i.. 

